Disk Imaging Calculation - How long should it take?

Posted on 2013-11-14
Last Modified: 2016-05-13
I've been searching for some way to calculate expected disk imaging durations but I can't find anything useful. Here's my scenario:

Mac OS X image = 16.5 GB
One (1) Client NIC = 1 Gbps
Imaging server (Deploy Studio) NIC = 1 Gbps

I would like to come up with a formula for determining what the duration should be for this one client. Then I would like to be able to add clients and see how it affects the duration.

Question by:ascendmax26
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Expert Comment

ID: 39649794
1 gig nics help, but the time it will take depends more on Sustained Throughput of the slowest storage device you are using.
The type of devices and how they are connected, will also have some impact.

ex: in the same system, using 2 IDE drives on the same channel (cable) will not be as good as 2 IDE drives on different channels (cables).

Author Comment

ID: 39649810
Thanks for the input, cora147. I assume some sort of disk I/O factor - both from the client and server sides - will be part of the equation. Network throughput is only part of the picture.
LVL 32

Expert Comment

ID: 39649900
With the 1gig nics, it (disk I/O) will probably be the biggest part. It's a fairly straight forward math problem.

Just don't forget to crank up Performance Monitor and get some real time numbers. Just to see how much (if any) lag the systems add to the situation.
What you "actually" get, doesn't always match what you "should" get according to the numbers, but you can include a "fudge" that will keep you close enough.

Have fun.   : )
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Author Comment

ID: 39662395
Doesn't sound like anyone has calculations I can use. I'm putting together my own and will share for input.
LVL 32

Accepted Solution

_ earned 500 total points
ID: 39663102
That's because there isn't one. It always depends on the system being used.

The main factors you need are
- file size
- listed drive i/o sustained speed
- then any "channel" limitation (IDE, SATA, SCSI, NETWORK, etc) that might come into play.

And since the actual numbers are not usually as good as the Theoretical Numbers, you need to run some actual tests to figure the "fudge" factor for that machine.

If doing a bunch of systems, that is a pita though, so as a "Rule of Thumb" I figure anything over 75% of the above TN, is good. Anything under, I might want to look into.
But that's just my little cheat.
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Expert Comment

ID: 41594387
Thank you much.     : )

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